---
tags:
  - macOS
  - Tahoe
  - activity-monitor
  - performance
  - troubleshooting
title: Troubleshooting Performance with Activity Monitor on macOS Tahoe
---

# Troubleshooting Performance with Activity Monitor on macOS Tahoe

Activity Monitor is the macOS equivalent of the Windows Task Manager. It provides a real-time view of how your Mac's resources are being used, helping you identify why your system might be running slowly or why your battery is draining fast.

## Opening Activity Monitor

You can find Activity Monitor in the **Utilities** folder, or launch it quickly via Spotlight:

1.  Press **Command + Space**.
2.  Type "Activity Monitor" and press **Enter**.

## The Five Tabs

The interface is divided into five tabs, each focusing on a specific system resource.

### 1. CPU
This tab shows how much processing power each app is using.
*   **% CPU**: Click this column header to sort by usage. If an app is consistently using a high percentage (e.g., over 80-90%) without you actively doing something heavy (like rendering video), it might be stuck.
*   **System/User/Idle**: At the bottom, you can see the total load. If "Idle" is low, your CPU is working hard.

### 2. Memory (RAM)
This is often the most important tab for general slowness.
*   **Memory Pressure**: Look at the graph at the bottom.
    *   **Green**: Your Mac has plenty of RAM available.
    *   **Yellow**: You are running out of RAM; macOS is compressing data.
    *   **Red**: You are out of RAM, and macOS is using your hard drive as temporary memory (Swap). This significantly slows down the system.
*   **Swap Used**: If this number is high, you might have too many apps open for your physical memory capacity.

### 3. Energy
Use this tab to find out what is draining your battery.
*   **Energy Impact**: A real-time score of battery usage.
*   **12 hr Power**: Shows the long-term impact of an app. Useful for finding background apps that drain battery over time.

### 4. Disk
Shows the amount of data being written to and read from your drive.

### 5. Network
Shows which apps are sending or receiving data over the internet.

## Stopping a Process

If an app is frozen or using too much CPU:

1.  Select the app in the list.
2.  Click the **X** button (Stop) in the toolbar at the top.
3.  **Quit**: Tries to close the app gracefully.
4.  **Force Quit**: Kills the app immediately (unsaved data will be lost).

## Related Guides
*   [Force Quit and Troubleshooting Frozen Apps on macOS Tahoe](force-quit.md)
*   [Master Guide to macOS Tahoe](macos-tahoe-master-guide.md)